Salmon and Trout

Varley, M. E.; Mills, Derek

doi:10.2307/3305

Cited by 3 publications

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As an alternative life history strategy, Atlantic salmon frequently become sexually mature in freshwater as parr without having previously migrated to sea and thus at a relatively small size in comparison with their anadromous counterparts (Baum et al, 2004; Hutchings, 2011; Hutchings & Myers, 1994; Myers et al, 1986; Shaw, 1836). The vast majority of records of sexual maturation in Atlantic salmon parr are for males (Mobley et al, 2021; Myers, 1984; Myers et al, 1986); however, there are a few records of female parr becoming sexually mature before sea migration (Bagliniere & Maisse, 1985; Mills, 1971; Power, 1969; Prouzet, 1981). The fitness advantage of early sexual maturation is that there is a higher probability of surviving to sexual maturity, compared with the alternative strategy of becoming mature only after a long‐distance migration to and from sea (Hutchings & Myers, 1994).…”

Section: Introductionmentioning

confidence: 99%

Smolting in post‐sexually mature male Atlantic salmon (Salmo salar L.) parr in the wild

Lothian,

Rodger,

Wilkie

et al. 2023

Ecology of Freshwater Fish

View full text Add to dashboard Cite

Conflicts can arise in developmental pathways that prevent an individual entering different developmental life stages that result in the expression of different phenotypes within a specific time period. In salmonids, theory suggests that sexual maturation may inhibit subsequent smolting within the same 12‐month period and that this is partly the result of the time and the apparently conflicting physiological changes for these processes to occur, and partly because of the energy requirements for these physiologically taxing processes. This study tested whether sexually mature male Atlantic salmon (Salmo salar L.) parr, caught in the autumn, would subsequently smolt the following spring. Through individual identification using PIT telemetry, minimum estimates of 3.0% (n = 6/203) and 5.9% (n = 1/17) of Atlantic salmon parr that were sexually mature in two river catchments during the autumn were subsequently identified as smolts in the following spring. We therefore suggest that, in line with previous studies on domesticated Atlantic salmon and laboratory‐based experiments, there is no developmental conflict but that life‐history expression is mediated by environmental and genetic processes.

show abstract

Section: Introductionmentioning

confidence: 99%

Smolting in post‐sexually mature male Atlantic salmon (Salmo salar L.) parr in the wild

Lothian,

Rodger,

Wilkie

et al. 2023

Ecology of Freshwater Fish

View full text Add to dashboard Cite

show abstract

Untitled

Madsen¹,

Mathiesen²,

Korsgaard³

1997

Fish Physiology and Biochemistry

View full text Add to dashboard Cite

Effects of Prey Abundance on Density and Territorial Behavior of Young Rainbow Trout (Salmo gairdneri) in Laboratory Stream Channels

Slaney¹,

Northcote²

1974

J. Fish. Res. Bd. Can.

144

View full text Add to dashboard Cite

When rainbow trout (Salmo gairdneri) fry (underyearlings) were introduced into laboratory channels at three different prey levels and permitted to emigrate voluntarily, their density remained highest at the highest prey level. The distribution of fry was positively associated with a gradient in prey abundance. Both territory size and frequency of aggressive encounter varied inversely with prey level; the higher the prey level, the smaller the territory and the lower the frequency of aggressive encounter. Emigration from the channels was neither as rapid nor as marked when prey level was reduced, compared to when fry were initially introduced to different prey levels. However, frequency of aggressive encounter significantly increased when the prey level was decreased and significantly decreased when the prey was increased.

show abstract

Salmon and Trout

Cited by 3 publications

References 0 publications

Smolting in post‐sexually mature male Atlantic salmon (Salmo salar L.) parr in the wild

Smolting in post‐sexually mature male Atlantic salmon (Salmo salar L.) parr in the wild

Untitled

Effects of Prey Abundance on Density and Territorial Behavior of Young Rainbow Trout (Salmo gairdneri) in Laboratory Stream Channels

Contact Info

Product

Resources

About